The October 15 Direct Final Rule revises a Final Rule issued originally in January 31, 2007, enhancing the safety standards of cylinders of compressed oxygen, other oxidizing gases, and chemical oxygen generators being transported in aircraft. The January 31 Final Rule amended the HMR to require these products to be transported in outer packaging that (1) meets the same flame penetration resistance standards as required for cargo compartment sidewalls and ceiling panels in transport category airplanes; and (2) provides certain thermal protection capabilities so as to retain its contents during an otherwise controllable cargo compartment fire.